Force-pump



(No Model.)

G. J. FRITZ.

.FORGE PUMP.

No. 262,394. Patented Aug. 8, 1882.

l N. PETERS, mwinmgmphu. wnhingw D. C.

UNITED STATES PATENT OFFICE.

GEORGE J. FRITZ, OF ST. LOUIS, MISSOURI.

FORCE-PUMP.

SPECIFICATION forming part of Letters Patent No. 262,394, dated August 8, 1882,

Application led February 7, 1882. (No model.)

To all whom it may concern.'

Be it known that I, GEORGE J. FRITZ, of the city of St. Louis, in the State ot' Missouri, have invented a certain new and useful Improvement in Force-Pumps, ot' which the following is a full, clear, and exact description, reference being had tothe accompanyingdrawings, forming part of this specilication.

My invention relates, rst, to a descending duct leading from the upper part of the plunger-cylinder to the chamber beneath the eduction-valve.

My invention relates secondly to guides for the plunger.

In the drawings, Figure l is an elevation. Fig. 2 is a vertical section on line 2 2, Fig. 3. Fig. 3 is a horizontal section on lille 3 3, Fig. 2.

A represents the imluction-port, and B the ednction-port, ofthe pump.

O and D represent the valves, and E and F their respective seats. The seats are formed separate from the main casting, and are tiXed in place in enlargements of the ports made to receive them (see Fig. 2) after the valves have been itted to them. The object of thus securing the seats in place is to avoid danger of their becoming loose, as they are liable to do when they are cemented in; and another advantage is that there is no danger of steam finding a passage between them and the casting. They can also be easily removed and replaced by new ones, and it is impossible for any pressure ot' the valves to displace them. The Valves have ordinary guide-wings.

c d are stems, which limit the upward movements of the valves by impingement against the depending stems ot' the valve-chamber heads G. The heads are secured in place by bolts H, and thus are easily removable to allow access to the valves.

I I are gum or other gaskets beneath the heads.

J is the plunger, working in a suitable stuifing-box, as usual.

K is the cylinder of the plunger.

L is the inlet-passage from the chamber of valve G.

tion is depended on in any degree to draw wa 5 5 ter into the pu-mp, steam forms in the cylinder and interferes with the successful operation ot' the pump. I provide my descending duct N (communicating with the upper part of the cylinder) to get rid of the steam as fast as it may be formed. Supposing steam to be present in the upper part of the cylinder, on the descent of the plunger the water escaping from the cylinder would force the steam out through the port M, and down through the duct N, and out through the port of the valve D. Thus there would be no accumulation of steam in the upper part of the cylinder, and the bad result of a gradually-increasing quantity of steam in the cylinder is avoided by clearing the cylinder of steam at each stroke of the plunger.

The plunger has secured to it a cross-head, O. By means of sleeves I) I? and nuts Q Q the cross-head is secured to gnide-stamlards It R, secured to and extending upward from the head of the plunger-cylinder. Thus the plunger is guided vand held in a perfectly vertical position in the stutlng-box.

I claim as my inventionl l. A force-pump provided with a descending duct between the upper part of the plunger-cylinder and the chamber beneath the ednctionvalve, as set forth.

2. In a force-pump, the combination olplunger-cylinder, cross-head secured to the plunger, guide-standards secured to the pump-cylinder, and sleeves and nuts connecting the cross-head with the standards, as set forth.

SAML. KNIGHT, GEO. H. KNIGHT. 

